List of US Post Office Stores in Picayune, MS Outlet Note Regular Brands US Post Office Mississippi Picayune Rating 4.5 based on 76 votes Official Website https://www.usps.com/ Products Postal Service NameAddressPhone Name/Address/Phone US Post Office outlet - Picayune 3353 Jackson Landing Rd (601) 798-7788 US Post Office outlet - Picayune 120 Highway 11 N (601) 798-7401 US Post Office outlet - Picayune 6342 Highway 11 N (601) 798-2876 People Also Viewed